Display does not Dim when Light Control Switch is Turned ON [10/2015 - ]: Procedure

1. Check the symptoms that occur by viewing the display.

   Result

   Result	Proceed to
   There is a delay in when the multi-display*1 or accessory meter assembly*2 dims after the navigation system is turned on with the light control switch in the tail or head position.	A
   The multi-display*1 or accessory meter assembly*2 dims for a moment and then becomes bright after the navigation system is turned on with the light control switch in the tail or head position.	B
   When the light control switch is in the tail or head position, the multi-display*1 or accessory meter assembly*2 dims but does not change to night mode.
   When the light control switch is in the tail or head position, the multi-display*1 or accessory meter assembly*2 neither dims nor switches to night mode.	C

   HINT: 

   • When the navigation system is activated with the light control switch in the tail or head position, before AVC-LAN communication is established, the multi-display*1 or accessory meter assembly*2 dims the display according to the illumination signal received via a direct line.
   • After AVC-LAN communication is established, the multi-display*1 or accessory meter assembly*2 dims the display according to a dimmer signal sent via a direct line.
   • The radio receiver assembly changes the multi-display*1 or accessory meter assembly*2 between daytime mode and night mode according to the illumination signal input.
   • *1: for 8 Inch Display
   • *2: for 12.3 Inch Display

Result: 

B 

See step  3

Result: 

C 

GO TO LIGHTING SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] 

Result: 

A 

See step  2

1. for 8 Inch Display
   1. Disconnect the multi-display connector.
   2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      K52-13 (GND1) - Body ground	Always	Below 1 Ω

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Multi-display)

   3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection	Condition	Specified Condition
      K52-2 (ILL) - K52-13 (GND1)	Light control switch in tail or head position	11 to 14 V

2. for 12.3 Inch Display
   1. Disconnect the accessory meter assembly connector.
   2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      K126-13 (GND1) - Body ground	Always	Below 1 Ω

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      *a	Front view of wire harness connector (to Accessory Meter Assembly)

   3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection	Condition	Specified Condition
      K126-2 (ILL) - K126-13 (GND1)	Light control switch in tail or head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - 09/2017]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Turn the light control switch to the tail or head position.
2. Check that daytime mode on the display adjustment screen is set to on.

   Result

   Result	Proceed to
   Daytime mode is set to on.	A
   Daytime mode is set to off.	B

Result: 

A 

CHANGE DAYTIME MODE SETTING TO OFF 

Result: 

B 

See step  4

1. Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Refer to OPERATION CHECK [10/2015 - ]

2. Check that the display changes between ON and OFF according to the light control switch operation.

   OK

   Light Control Switch	Display
   Tail or head	ON
   Off	OFF

   HINT: 

   The display is updated once per second. It is normal for the display to lag behind the actual switch operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - 09/2017]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2017 - ] 

Result: 

NG 

See step  5

1. Disconnect the radio receiver assembly connector.
2. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K57-12 (GND1) - Body ground	Always	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Radio Receiver Assembly)

3. Measure the voltage according to the value (s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K57-14 (ILL+) - K57-12 (GND1)	Light control switch in tail or head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - 09/2017]  , or refer to  PROBLEM SYMPTOMS TABLE [09/2017 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR